METHOD FOR THE OPERATION OF A PITCH SYSTEM OF A WIND TURBINE

摘要

A method for the operation of a pitch system of a wind turbine with at least one rotor blade, wherein the pitch system has at least one input rectifier and at least one pitch drive, each rotor blade can be rotated around its longitudinal axis by the one pitch drive or by at least one of several pitch drives, each input rectifier is supplied with alternating voltage by a supply network, and each pitch drive is supplied with electric power by the one input rectifier or by at least one of several input rectifiers, each pitch drive is connected to an emergency power storage device, whereby each pitch drive can be supplied with electric power by the emergency power storage device that is connected to it.

主权项

1. A method for operating a pitch system of a wind turbine with at least one rotor blade comprising the steps of:
providing a pitch system having at least one input rectifier and at least one pitch drive, whereby each rotor blade can be rotated around its longitudinal axis by the one pitch drive or by at least one of several pitch drives; supplying each input rectifier with alternating voltage by a supply network; supplying each pitch drive with electric power by the one input rectifier or by at least one of several input rectifiers, connecting each pitch drive to an emergency power storage device, whereby each pitch drive can be supplied with electric power by the emergency power storage device that is connected to it; providing the pitch system with at least one supply voltage measuring device; providing each input rectifier with at least one semiconductor switching element with which a flow of current from the supply network into the respective input rectifier can be blocked; measuring the voltage of the supply network with each supply voltage measuring device; blocking the flow of current from the supply network into the respective input rectifier with each semiconductor switching element if the measured voltage of the supply network or a value calculated from several measured voltages exceeds a first voltage value; and supplying each pitch drive with electric power by the emergency power storage device that is connected to it.